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Contains helper classes for the frontend that are used by {@link
polyglot.main polyglot.main}.  The 
{@link polyglot.frontend.Compiler Compiler} class manages the input
and output files and starts the compilation process for a given
language extension.  
Language extensions implement the {@link polyglot.frontend.ExtensionInfo ExtensionInfo} interface.  The
The class {@link polyglot.frontend.AbstractExtensionInfo AbstractExtensionInfo}
contains code for invoking the individual passes of the extension.
Subclasses of {@link polyglot.frontend.AbstractExtensionInfo AbstractExtensionInfo} define the passes for the extension.
The base Java compiler is implemented in the
{@link polyglot.ext.jl.ExtensionInfo polyglot.ext.jl.ExtensionInfo} class.
Language extensions typically (but not necessarily) subclass
{@link polyglot.ext.jl.ExtensionInfo polyglot.ext.jl.ExtensionInfo}.

@see polyglot.frontend.Compiler
@see polyglot.frontend.ExtensionInfo
@see polyglot.frontend.AbstractExtensionInfo 
@see polyglot.ext.jl.ExtensionInfo 

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